EP1982216A2 - Electromagnetic surveying - Google Patents
Electromagnetic surveyingInfo
- Publication number
- EP1982216A2 EP1982216A2 EP07712693A EP07712693A EP1982216A2 EP 1982216 A2 EP1982216 A2 EP 1982216A2 EP 07712693 A EP07712693 A EP 07712693A EP 07712693 A EP07712693 A EP 07712693A EP 1982216 A2 EP1982216 A2 EP 1982216A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- transmitter
- stratum
- nature
- changes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000013535 sea water Substances 0.000 claims description 8
- 238000011835 investigation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 125000001183 hydrocarbyl group Chemical group 0.000 description 3
- 230000000644 propagated effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
- G01V3/17—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat operating with electromagnetic waves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Definitions
- the present invention relates to electromagnetic (EM) surveying, in particular for seabed logging, and is concerned with providing a system for determining the resistivity or conductivity of subsea strata, especially the upper strata, e.g. at a depth of up to about 100 m or even greater.
- EM electromagnetic
- seismic techniques are capable of revealing the structure of the subterranean strata with some accuracy.
- a seismic survey can reveal the location and shape of a potential reservoir, it can normally not reveal the nature of the reservoir.
- This contemplates a method for searching for a hydrocarbon containing subterranean reservoir which comprises: applying a time varying electromagnetic field to subterranean strata; detecting the electromagnetic wave field response; seeking, in the wave field response, a component representing a refracted or ducted wave; and determining the presence and/or nature of any reservoir identified based on the presence or absence of a wave component refracted or ducted by hydrocarbon layer.
- a ducted wave behaves differently, depending on the nature of the stratum in which it is propagated. In particular, the propagation losses in hydrocarbon stratum are much lower than in a water-bearing stratum while the speed of propagation is much higher. Thus, when a hydrocarbon-bearing reservoir is present, and an EM field is applied, a strong and rapidly propagated ducted wave can be detected. This may therefore indicate the presence of the reservoir or its nature if its presence is already known.
- Electromagnetic surveying techniques in themselves are known. However, they are not widely used in practice. In general, the reservoirs of interest are about 1 km or more below the seabed. In order to carry out electromagnetic surveying as a stand alone technique in these conditions, with any reasonable degree of resolution, short wavelengths are necessary. Unfortunately, such short wavelengths suffer from very high attenuation. Long wavelengths do not provide adequate resolution. For these reasons, seismic techniques are preferred.
- the resistivity of seawater is about 0.3 ohm-m and that of the overburden beneath the seabed would typically be from 0.3 to 4 ohm-m, for example about 2 ohm-m.
- the resistivity of an oil reservoir is likely to be about 20- 300 ohm-m. This large difference can be exploited using EM surveying techniques.
- the resistivity of a hydrocarbon-bearing formation will be 20 to 300 times greater than water-bearing formation.
- an EM source such as an electric dipole transmitter antenna on or close to the sea floor induces (EM) fields and currents in the sea water and in the subsurface strata.
- EM electromagnetic field
- the EM-fields are strongly attenuated due to the high conductivity in the saline environment, whereas the subsurface strata with less conductivity potentially can act as a guide for the EM-fields (less attenuation).
- the frequency is low enough (in the order of 1 Hz)
- the EM- waves are able to penetrate deep into the subsurface, and deeply buried geological layers having higher electrical resistivity than the overburden (as e.g. a hydrocarbon filled reservoir) will affect the EM-waves.
- an EM wave incident upon a high resistive layer may excite a ducted (guided) wave mode in the layer.
- the ducted mode is propagated laterally along the layer and leaks energy back to the overburden and receivers positioned on the sea floor.
- the terms "refracted” and “ducted” are used in this specification to refer to this wave mode.
- a signal is emitted from a towed source antenna, parallel to, and close to the sea floor; and the wavefield response detected by a number of stationary receivers, distributed on the sea floor, is recorded.
- the strength of the emitted signal is proportional to the current I A delivered to the antenna, and this current is accurately monitored and recorded. [If the current source is very stable, the current would, of course be constant.] It is an object of the present invention to provide an apparatus and method for detecting and/or determining the nature of a subterranean reservoir.
- a method of determining the nature of a subterranean stratum which comprises: deploying an electric dipole transmitter antenna, preferably with its axis generally horizontal; applying an electromagnetic (EM) field to the stratum containing the reservoir using the transmitter; measuring the current and voltage at the antenna terminals during the EM transmission; and determining the nature of the stratum from changes in the measured voltage.
- EM electromagnetic
- analysis of the logged receiver data may reveal the presence of a fast, low attenuation guided wave, and thus the presence of a high resistivity stratum which may be oil bearing.
- High resistivity may, however, occur, not in oil bearing strata only, but also in strata consisting of e.g. solid salt or rock containing little or no water.
- the input impedance of the towed transmitter antenna is determined by the following parameters:
- Parameters 1-4 may be separately monitored and accounted for, and the remaining variations of Z A provide information about the resistivity distribution below the sea floor.
- the transmitter is located on or close to the seabed or the bed of some other area of water.
- the frequency of the EM field is continuously varied over the transmission period.
- the field is transmitted for a period of time for 3 seconds to 60 minutes, for example, from 10 seconds to 5 minutes.
- the method is repeated at different locations.
- the transmitter is towed over the seabed while the EM field is being transmitted.
- the transmitter is preferably towed as close to the sea floor as possible.
- the distance to the sea floor should be much less than the length of the antenna (e.g. 20 m to 200 m), and much less than the wavelength of the frequencies to be used.
- the transmitter includes an inertia sensor to sense the difference between a change in the sea floor height and a rise/fall of the transmitter.
- the transmitted signal shape may be modified so that it contains more of the harmonics which are useful for mapping the conductivity. It will be understood that calculation of the conductivity of the upper strata of the seabed as a function of position and depth is also desirable.
- the method of the invention is carried out during a conventional EM survey using receivers to detect the transmission wavefield response.
- the method may also be used in conjunction with seismic surveying techniques.
- the invention extends to a method for detecting different subterranean strata and is particularly applicable to the detection and identification of hydrocarbon bearing strata.
- the wavelength of the transmission is given by the formula
- ⁇ is the wavelength of the transmission through the subsea strata and h is the distance from the seabed to the strata under investigation.
- the transmission frequency is from 0.01 Hz to 1 kHz, for example, from 0.1 to 20 Hz.
- Figure 1 is a schematic diagram showing how the invention may be carried out in practice.
- Figure 1 shows an antenna 11 towed by a vessel 12 at a distance h above the sea floor 13.
- the antenna 1 1 emits a wavef ⁇ eld, whose strength is proportional to the current I A delivered to the antenna 11 , and this is accurately monitored and recorded.
- V A V A /I A
- Z A Z A /I A , ma y t> e calculated.
- the impedance function By means of the impedance function, the following important parameters may be calculated, namely, the distance from the antenna to the sea floor, the conductivity of the sea water, and the step in conductivity at the sea floor, and possibly more detail of the conductivity variation immediately below the sea floor.
- ⁇ i and ⁇ 2 are the conductivities above and below the sea floor 13, respectively.
- the reflected signal induces a voltage V R in the antenna, thereby altering the voltage and the current at the antenna terminals, thus ultimately causing a change in the antenna impedance.
- the amplitude and phase of VA vary with the frequency/, and the distance h between the antenna and the sea floor. At sufficiently high frequencies, V A is negligible, and the impedance depends only on the frequence, and on the conductivity ⁇ 1; which may then be calculated.
- the current of the image antenna is p ⁇ A-
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A method of determining the nature of subterranean strata. The transmitter antenna (11) is towed by vessel (12) at a distance h above the sea floor (13). The antenna (11) in its wave field whose strength is proportional to the current delivered to the antenna (11) and this is monitored. The input voltage to the antenna is also measured and changes in antenna impedance are calculated. Changes in antenna impedance are used together with seismic information to determine the nature of the subsea strata.
Description
Electromagnetic Surveying
The present invention relates to electromagnetic (EM) surveying, in particular for seabed logging, and is concerned with providing a system for determining the resistivity or conductivity of subsea strata, especially the upper strata, e.g. at a depth of up to about 100 m or even greater.
Currently, the most widely used techniques for geological surveying, particularly in sub-marine situations, are seismic methods. These seismic techniques are capable of revealing the structure of the subterranean strata with some accuracy. However, whereas a seismic survey can reveal the location and shape of a potential reservoir, it can normally not reveal the nature of the reservoir.
It has been appreciated by the present applicants that while the seismic properties of hydrocarbon filled strata and water-filled strata do not differ significantly, their electromagnetic resistivities do differ. Thus, by using an electromagnetic surveying method, these differences can be exploited and the success rate in predicting the nature of a reservoir can be increased significantly.
Consequently, a method and apparatus embodying these principles form the basis of the present applicants' EP-A-1256019.
This contemplates a method for searching for a hydrocarbon containing subterranean reservoir which comprises: applying a time varying electromagnetic field to subterranean strata; detecting the electromagnetic wave field response; seeking, in the wave field response, a component representing a refracted or ducted wave; and determining the presence and/or nature of any
reservoir identified based on the presence or absence of a wave component refracted or ducted by hydrocarbon layer.
A ducted wave behaves differently, depending on the nature of the stratum in which it is propagated. In particular, the propagation losses in hydrocarbon stratum are much lower than in a water-bearing stratum while the speed of propagation is much higher. Thus, when a hydrocarbon-bearing reservoir is present, and an EM field is applied, a strong and rapidly propagated ducted wave can be detected. This may therefore indicate the presence of the reservoir or its nature if its presence is already known.
Electromagnetic surveying techniques in themselves are known. However, they are not widely used in practice. In general, the reservoirs of interest are about 1 km or more below the seabed. In order to carry out electromagnetic surveying as a stand alone technique in these conditions, with any reasonable degree of resolution, short wavelengths are necessary. Unfortunately, such short wavelengths suffer from very high attenuation. Long wavelengths do not provide adequate resolution. For these reasons, seismic techniques are preferred.
However, while longer wavelengths applied by electromagnetic techniques cannot provide sufficient information to produce an accurate indication of the boundaries of the various strata, if the geological structure is already known, they can be used to determine the nature of a particular identified formation, if the possibilities for the nature of that formation have significantly differing electromagnetic characteristics. The resolution is not particularly important and so longer wavelengths which do not suffer from excessive attenuation can be employed.
The resistivity of seawater is about 0.3 ohm-m and that of the overburden beneath the seabed would typically be from 0.3 to 4 ohm-m, for example about 2 ohm-m. However, the resistivity of an oil reservoir is likely to be about 20- 300 ohm-m. This large difference can be exploited using EM surveying techniques. Typically, the resistivity of a hydrocarbon-bearing formation will be 20 to 300 times greater than water-bearing formation.
Thus, an EM source such as an electric dipole transmitter antenna on or close to the sea floor induces (EM) fields and currents in the sea water and in the subsurface strata. In the sea water, the EM-fields are strongly attenuated due to the high conductivity in the saline environment, whereas the subsurface strata with less conductivity potentially can act as a guide for the EM-fields (less attenuation). If the frequency is low enough (in the order of 1 Hz), the EM- waves are able to penetrate deep into the subsurface, and deeply buried geological layers having higher electrical resistivity than the overburden (as e.g. a hydrocarbon filled reservoir) will affect the EM-waves. Depending on the angle of incidence and state of polarisation, an EM wave incident upon a high resistive layer may excite a ducted (guided) wave mode in the layer. The ducted mode is propagated laterally along the layer and leaks energy back to the overburden and receivers positioned on the sea floor. The terms "refracted" and "ducted" are used in this specification to refer to this wave mode.
In seabed logging, a signal is emitted from a towed source antenna, parallel to, and close to the sea floor; and the wavefield response detected by a number of stationary receivers, distributed on the sea floor, is recorded. The strength of the emitted signal is proportional to the current IA delivered to the antenna, and this current is accurately monitored and recorded. [If the current source is very stable, the current would, of course be constant.]
It is an object of the present invention to provide an apparatus and method for detecting and/or determining the nature of a subterranean reservoir.
According to one aspect of the invention, there is provided a method of determining the nature of a subterranean stratum which comprises: deploying an electric dipole transmitter antenna, preferably with its axis generally horizontal; applying an electromagnetic (EM) field to the stratum containing the reservoir using the transmitter; measuring the current and voltage at the antenna terminals during the EM transmission; and determining the nature of the stratum from changes in the measured voltage.
Changes in the nature of subterranean strata cause changes in the resistivity of the seabed as a whole beneath the sea floor. Since the resistivity of the source, antenna and sea water should remain constant, these changes in seabed resistivity alone may cause the voltage at the antenna terminals to vary and so the variations in antenna voltage will be representative of the of the changes in the nature of the strata in the seabed.
Thus, analysis of the logged receiver data may reveal the presence of a fast, low attenuation guided wave, and thus the presence of a high resistivity stratum which may be oil bearing.
High resistivity may, however, occur, not in oil bearing strata only, but also in strata consisting of e.g. solid salt or rock containing little or no water. In order to determine the nature of the high resistivity stratum, it is generally necessary to carry out a detailed analysis of the logged reciever data, in order to create a model, based on the seismic data, in which resistivity values are assigned to the various strata. From the geological knowledge of the region in question, the most likely nature of a high resistivity stratum may then be ascertained.
The accuracy of the model is limited by the receiver data, and may be improved by utilising other available information. One means of obtaining such additional information is by monitoring the input impedance of the towed transmitter antenna ZA. = VA/IA, where IA is the antenna current and IA the terminal voltage.
The input impedance of the towed transmitter antenna is determined by the following parameters:
1. The configuration of the antenna.
2. The conductivity of the sea water
3. The position and orientation of the antenna with respect to the sea floor
4. The topography of the sea floor (plane or otherwise). 5. The resistivity distribution below the sea floor.
Parameters 1-4 may be separately monitored and accounted for, and the remaining variations of ZA provide information about the resistivity distribution below the sea floor.
In one embodiment, the transmitter is located on or close to the seabed or the bed of some other area of water. Preferably, the frequency of the EM field is continuously varied over the transmission period. Preferably, the field is transmitted for a period of time for 3 seconds to 60 minutes, for example, from 10 seconds to 5 minutes. Preferably, the method is repeated at different locations.
In a more preferred embodiment, the transmitter is towed over the seabed while the EM field is being transmitted. The transmitter is preferably towed as close
to the sea floor as possible. Preferably, the distance to the sea floor should be much less than the length of the antenna (e.g. 20 m to 200 m), and much less than the wavelength of the frequencies to be used.
Preferably, the transmitter includes an inertia sensor to sense the difference between a change in the sea floor height and a rise/fall of the transmitter.
In addition, the transmitted signal shape may be modified so that it contains more of the harmonics which are useful for mapping the conductivity. It will be understood that calculation of the conductivity of the upper strata of the seabed as a function of position and depth is also desirable.
Preferably, the method of the invention is carried out during a conventional EM survey using receivers to detect the transmission wavefield response. The method may also be used in conjunction with seismic surveying techniques.
The invention extends to a method for detecting different subterranean strata and is particularly applicable to the detection and identification of hydrocarbon bearing strata.
Preferably, the wavelength of the transmission is given by the formula
0.0 Ih < λ < 30h; or more preferably,
O.lh < λ < 1Oh
wherein λ is the wavelength of the transmission through the subsea strata and h is the distance from the seabed to the strata under investigation. Preferably, the transmission frequency is from 0.01 Hz to 1 kHz, for example, from 0.1 to 20 Hz.
The invention extends to a process for the production of a survey report by carrying out a method according to the invention, and a survey report produced in this way.
The invention may be carried into practice in various ways and an embodiment will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a schematic diagram showing how the invention may be carried out in practice.
Figure 1 shows an antenna 11 towed by a vessel 12 at a distance h above the sea floor 13. The antenna 1 1 emits a wavefϊeld, whose strength is proportional to the current IA delivered to the antenna 11 , and this is accurately monitored and recorded. By also monitoring and recording the voltage VA at the antenna terminals, the impedance of the antenna, ZA = VA/IA, may t>e calculated. ZA is a function of the frequency,/, and when a multi frequency signal is employed, this function may be found within a range of frequencies extending from/ = 0 to a maximum frequency fmax, determined by the frequency spectrum of the signal, and the accuracy of the voltage and current measurements. By means of the impedance function, the following important parameters may be calculated, namely, the distance from the antenna to the sea floor, the conductivity of the sea water, and the step in conductivity at the sea floor, and possibly more detail of the conductivity variation immediately below the sea floor.
Part of the emitted signal is reflected at the sea floor, the reflection coefficient being
(D σi - O2
where σi and σ2 are the conductivities above and below the sea floor 13, respectively. The reflected signal induces a voltage VR in the antenna, thereby altering the voltage and the current at the antenna terminals, thus ultimately causing a change in the antenna impedance. The amplitude and phase of VA vary with the frequency/, and the distance h between the antenna and the sea floor. At sufficiently high frequencies, VA is negligible, and the impedance depends only on the frequence, and on the conductivity σ1; which may then be calculated.
Assuming σ2 constant, the reflected signal may be found from the simple model indicated in Figure 1, as emitted from an image antenna 14 located the distance h below the (plane) sea floor, with σ2 = σj . The current of the image antenna is pΪA-
Claims
1. A method of determining the nature of a subterranean stratum which comprises deploying an electric dipole transmitter antenna; applying an electromagnetic (EM) field to the stratum containing the reservoir using the transmitter; measuring the current and voltage at the antenna terminals during the EM transmission; and determining the nature of the stratum from changes in the measured voltage.
2. A method as claimed in Claim 1, in which the input impedance of the antenna is calculated from the measured current and voltage and the nature of the stratum is determined from changes in the impedance.
3. A method as claimed in Claim 2, in which the changes in the impedance are used to calculate the resistivity of the stratum and the nature of the stratum is deduced from the resistivity.
4. A method as claimed in Claim 3, in which the resistivity is combined with existing geological knowledge of the stratum to determine the nature of the stratum.
5. A method as claimed in Claim 4, in which the existing geological knowledge comprises seismic data.
6. A method as claimed in any of Claims 2 to 5, in which the conductivity of the sea water is monitored and changes in sea water conductivity are taken into account in determining the antenna input impedance.
7. A method as claimed in any of Claims 2 to 6, in which the height of the antenna above the sea floor is monitored and changes in the antenna height are taken into account in determining the antenna input impedance.
8. A method as claimed in any preceding claim in which the transmitter antenna is deployed with its axis generally horizontal.
9. A method as claimed in any preceding claim, in which the transmitter is towed over the seabed while the EM field is being transmitted.
10. A method as claimed in any preceding claim in which the transmitter is towed at a distance between 20 m and 200 m from the seabed.
1 1. A method as claimed in any preceding claim in which the transmitter is towed at a distance from the seabed which is significantly less than the wave length of the frequencies of the EM transmitter.
12. A method as claimed in any preceding claim in which the transmitted signal shape contains harmonics which are used in the determination of the antenna input impedance.
13. A method as claimed in any preceding claim in which the wave length of the EM transmitter is given by the formula
O.Olh ≤ λ < 30h,
wherein λ is the wave length of the transmission through the subsea strata and h is the distance from the seabed to the strata under investigation.
14. A method as claimed in any preceding Claim in which the transmission frequency is from 0.01 Hz to 1 kHz.
15. A process for the production of a survey report which comprises carrying out a method as claimed in any preceding Claim and formulating the voltage and/or impedance changes together with the related conclusions into a report.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0602656A GB2435693A (en) | 2006-02-09 | 2006-02-09 | Seabed electromagnetic surveying |
PCT/GB2007/000459 WO2007091086A2 (en) | 2006-02-09 | 2007-02-09 | Electromagnetic surveying |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1982216A2 true EP1982216A2 (en) | 2008-10-22 |
Family
ID=36119824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07712693A Withdrawn EP1982216A2 (en) | 2006-02-09 | 2007-02-09 | Electromagnetic surveying |
Country Status (10)
Country | Link |
---|---|
US (1) | US8188748B2 (en) |
EP (1) | EP1982216A2 (en) |
CN (1) | CN101379414A (en) |
AU (1) | AU2007213522A1 (en) |
CA (1) | CA2641813A1 (en) |
DK (1) | DK200801000A (en) |
GB (1) | GB2435693A (en) |
NO (1) | NO20083824L (en) |
RU (1) | RU2008136183A (en) |
WO (1) | WO2007091086A2 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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GB2409900B (en) | 2004-01-09 | 2006-05-24 | Statoil Asa | Processing seismic data representing a physical system |
GB2420855B (en) | 2004-12-02 | 2009-08-26 | Electromagnetic Geoservices As | Source for electromagnetic surveying |
GB2422673B (en) * | 2005-02-01 | 2010-03-24 | Electromagnetic Geoservices As | Optimum signal for sea bed logging |
GB2439378B (en) * | 2006-06-09 | 2011-03-16 | Electromagnetic Geoservices As | Instrument for measuring electromagnetic signals |
GB2442749B (en) * | 2006-10-12 | 2010-05-19 | Electromagnetic Geoservices As | Positioning system |
GB2445582A (en) | 2007-01-09 | 2008-07-16 | Statoil Asa | Method for analysing data from an electromagnetic survey |
EP2150842A2 (en) | 2007-05-14 | 2010-02-10 | Ocean Floor Geophysics INC. | Underwater electric field electromagnetic prospecting system |
GB2466764B (en) | 2008-10-02 | 2013-03-27 | Electromagnetic Geoservices As | Method for enhanced subsurface electromagnetic sensitivity |
WO2010123696A2 (en) * | 2009-04-10 | 2010-10-28 | Schlumberger Canada Limited | Marine source to borehole electromagnetic mapping of sub-bottom electrical resistivity |
US8378685B2 (en) | 2010-03-22 | 2013-02-19 | Westerngeco L.L.C. | Surveying a subterranean structure using a vertically oriented electromagnetic source |
GB2481845B (en) | 2010-07-08 | 2014-04-30 | Electromagnetic Geoservices As | Low noise marine electric field sensor system |
US20120323541A1 (en) * | 2011-06-14 | 2012-12-20 | Seoul National University R&Db Foundation | Seismic imaging method considering a contour of the sea bottom |
RU2491580C1 (en) * | 2012-02-07 | 2013-08-27 | Общество с ограниченной ответственностью "Сибирская геофизическая научно-производственная компания" | Method of measuring geophysical characteristics using successive inversion of geoelectric data with additional time filter |
US9194225B2 (en) * | 2012-11-07 | 2015-11-24 | Chevron U.S.A. Inc. | Systems and methods for sensing a fluid level within a pipe |
US20140266215A1 (en) * | 2013-03-12 | 2014-09-18 | Pgs Geophysical As | Systems and methods for measuring water properties in electromagnetic marine surveys |
US9274241B2 (en) * | 2013-03-14 | 2016-03-01 | Pgs Geophysical As | Method and system for suppressing swell-induced electromagnetic noise |
CN110989019B (en) * | 2019-12-26 | 2021-10-08 | 中国科学院电工研究所 | Method for acquiring and processing magnetic characteristic in-situ detection data of seabed sediment |
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US20100052688A1 (en) | 2010-03-04 |
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WO2007091086A3 (en) | 2008-06-19 |
WO2007091086A2 (en) | 2007-08-16 |
AU2007213522A1 (en) | 2007-08-16 |
CN101379414A (en) | 2009-03-04 |
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DK200801000A (en) | 2008-09-15 |
RU2008136183A (en) | 2010-03-20 |
GB2435693A (en) | 2007-09-05 |
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